Real-Time Voice Signal Acquisition and Analysis System Using PC Sound Card and MATLAB

This real-time voice signal acquisition and analysis system leverages PC sound cards and MATLAB to provide comprehensive voice processing capabilities. The system implements real-time audio input through MATLAB's Data Acquisition Toolbox with functions like analoginput() and addchannel() for sound card configuration. It features an intuitive graphical user interface (GUI) developed using MATLAB's App Designer or GUIDE, enabling users to perform various voice signal analyses efficiently. The system incorporates multiple analysis tools and algorithms including Fast Fourier Transform (FFT) for spectral analysis, waveform display for time-domain characteristics, and voice activity detection (VAD) algorithms. Users can extract voice signal features such as pitch frequency, formants, and energy distribution through implemented signal processing functions like spectrogram(), fft(), and filter design tools. The platform includes advanced data visualization capabilities using MATLAB's plotting functions (plot(), spectrogram(), waterfall()) to display analysis results through interactive graphs and charts, allowing intuitive observation of voice signal properties. Core functionality involves buffer management for continuous data streaming, real-time signal processing loops with while/for iterations, and event-driven callback functions for user interaction. The system architecture supports both acquisition and playback modes using audiorecorder() and audioplayer() objects, with configurable parameters for sample rates, bit depth, and buffer sizes. Overall, this represents a fully-featured, user-friendly tool suitable for various voice signal acquisition and analysis tasks in research and educational applications.